Yannick Kieffel

Yannick Kieffel

GE-Grid Solutions


Yannick Kieffel is the Head of the Materials Research Department of the High Voltage Switchgear Research Center – in Villeurbanne (France) at Grid Solutions, a GE and Alstom joint venture, in GE’s Energy Management Business. He joined GE’s Grid Solutions, when it was formed in 2015. Yannick Kieffel joined Alstom Grid in 2003 as Materials Research & Development engineer and took the head of the Materials Research Department in 2007. Since 2010, and in addition to his mission in R&D, Yannick is the Grid Solutions Eco-Design coordinator federating Product Lines actions and deploying eco-design policy. Yannick is a Senior Expert in the field of gaseous and solid insulation for the high voltage products and is member of the IEEE Dielectric and Electrical Insulation Society as well as CIGRE and IEC. He is actively working on SF6 regulation and SF6-free solutions. Therefore, Yannick is responsible for the g3 (green gas for grid) technology development for air and gas insulated solutions. Yannick Kieffel obtained a Ph. D. degree in 2001 in Physics and Materials Sciences at the University of Grenoble (France).



g3 - A Breakthrough Technology

Green Gas for Grid (g3) is GE.s environmentally friendly alternative gas to SF6 developed for high voltage (HV) electrical transmission equipment. g3 products feature the same ratings and same dimensional footprint as the state-of-the-art SF6 ones, with a drastically reduced environmental impact: more than 99% less gas global warming potential (GWP), comparatively. Also, g3 products operate with no restriction under the same temperature range as SF6 products (down to -30°C).

First applications now available

GE has a number of g3 initiatives currently underway on 12 sites that together will reduce the impact of the installed gas masses by more than 172,000 tons of CO2 equivalent and cut GHG emissions by more than 99%. These projects include 51 GIS bays, 483 meters of GIL, 6 AIS Current transformers.

g3 portfolio

145kV Gas-Insulated Substation, 40 kA, designed for -25°C applications.

420kV Gas-Insulated lines, 63kA, 40kA, designed for -25°C applications.

245kV Current Transformers, Designed for -30°C applications.

123kV Voltage Transformers, designed for -30°C applications.

123kV Combined metering units, designed for -30°C applications.

The 2019 presentation will focus on the gas characteristics (what is g3) with a special focus on the gas handling experience gained on site over the past two years and will cover the wide range of g3 available products with a special emphasize on the return of experience from a utility point of view. On top of that, the last development ongoing, said the 145kV Dead Tank, designed to address the US market will be presented.